Computing mechanism.



W. WRIGHT.

OMPUTING MECHANISM.

APPLICATIO 0 NOV. 13. 1908. RENEWED AUG. 3,

1,185,566. 4 Pa ed May30, 1916.

ATTORNEY UNITED STATES PATENT oEEioE.

WALTER WRIGHT, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR, BY, MESNE ASSIGN-MENTS, TO UNDERWOOD COMPUTING JREILEIHINE COMPANY, A CORPORATION OF NEWYORK.

Specification of Letters Patent.

COMPUTING MECHANISM.

Patented May 30, 1916.

Application filed November 13, 1908, Serial No. 462,498. Renewed August3, 1911. Serial No. 642,042.

To all whom it may concern:

Be it known that I, \VALTER \Vnrorrr, a citizen of the United. States,residing at San Francisco and State of California, have invented new anduseful Improvements in Computing Mechanism, of which the following is aspecification.

The present invention relates to computing mechanism.

The object of the invention is to provide a series of computing wheels,which are always in positive engagement with their respective carryingwheels, and which can be rotated in either direction and thus performeither addition or subtraction.

A. further object is to provide a continuous series of such mechanismsin operative connection with each other, said series to contain anyreasonable number of comput ing wheels, the construction being such thatthe number need not be limited.

A further object is to provide mechanism whereby when any wheel of theseries may be operated, all of said wheels except the one in operativeengagement with the operating means, are positively locked againstpossible rotation, except when carrying from one wheel to the next; andwherebyany computing wheel, while in operative engagement with theoperating means, is free to rotate therewith, and through such rotationit becomes the master or operating wheel, through which the nextcomputing wheel to the left, or any number of such computing wheels atthat time in the operating zone, may be actuated when it is necessary tocarry or transfer from one wheel to the next in the performance ofaddition or subtraction. l

A further object is to provide mechanism,

levers s rin s and safet devices heretofore used to accomplish thisresult, are dispensed with and made unnecessary.

A further object is to provide a. mechanism of this character which maybe used in connection with operating means laterally stationary, and thecomputing mechanism movable, or the computing mechanism fixed againstlateral movement, the operating means being laterally movable, andwhereby the lateral movement of either the computing mechanism or theoperating means, enables the computing wheel in operative engagementwith the operating means to rotate freelytherewith, and at the same timethrough such rotation freely rotate through one-tenth of a revolutionany desired number of computing wheels of the series in the operatingZone then on the left, whenever it is necessary to carry from one wheelto the next, either in the performance of addition or subtraction.

As shown the present mechanism is actuated by means carried on a rotarydriving shaft, over which the number wheels move in a' step by stepmovement, the spacing means being equal to the width of a number wheel,or the computing wheels may be stationary and the operating means movethrough the computing wheels. However, the invention is not limited tointernal actuating means, as the computing wheels can just as readily berotated by external or utside operating means.

In the accompanying drawing, Figure 1 is a side elevation of thecomputing mechanism partly shown in section, and parts being brokenaway; Fig. 2 is a transverse section on the line 22 of Fig. 1; Fig. 8 isa detail of one of the driven gear wheels.

For convenience, the present invention will be described as applied to atypewriting machine, but it is understood that it is not limited to thispurpose.

The computing wheel 1. together with the gear portion 2, secured theretoon the right, is of a width corresponding to a writing space of atypewriter; and a sufficient number of such wheels may be combined in aframe or carriage, to extend through a distance corresponding withv thenumber of writing spaces to the writing line of a typewriter, therebeing in such case one number wheel for each writing space, except ineach 1 .end plates 13 and part1 will fourth writing space. at whichpoints the huh of the third computing wheel extends th 'ough a partitionand occupies with the collar 5 a double space, or the space of twocmnputing wheels. it these points the driving means are rendered ii11p-c -ati=e, the internal gg ea f teeth, 3 hereafter referred to, on theer-itended huh portion 5 of the com puting wheel, heing cut away fromthat portion oi" such third wheel, thus peri'nitting the operating:111ez1ns to rerolre freely therein without altectins the rotation of thecomputing wheels. This also allows, when used in conneuion with arintinp; mechanism, for the printing of eriod or comma in such tourlhspaces. w

h could he used to advantage in dividing he hundrecs from the thousandl1 o san d s from millions millions from hi. dollars from cents, etc.

Each computing wheel is composed of a main body portion 1 and a gear 2,secured to the main portion on the right, the outside diameter of thegear teeth of the wheel 2 being {lush with the outside diameter of themain body of the wheel 1, upon the surface of which the nine digits and0 are formed. The hub is also provided with ten internal gear teeth 3,thus providing a corresponding number of recesses 41 capable of beingselectively engaged by lu s or pins (3 extending laterally from a dportion 7 of a hub or collar 8 secured to a driving shaft 9. The pins 6are pr ferably formed upon a raised portion '1' 01 the huh 8. the hubheing cut away at each side of said raised portion so as to make theoutside diameter the same as the internal diameter of the stationarytubes 10. each or which, at one end. rests upon said lowered portion ofthe hub 8, their other ends being secured st rotation by collars 11 onarms 12 supported on the frame of the machine.

The fixed or stationari' tubes and the raised portion of the huh 8 arehoth 01" the same diameter as the internal gear teeth ol? the computingwheel 1. The computing wheels are supported in 5* frame comprising)tions 14'. through which latter extend rods 15; and said wheels, in thestep by step movement of the frame or carriage. slide orer the fixedtubes 10.

The carr no mechanism is composed of a gear wheel 16 and a Genera lockwheel 17, the hub portion each being formed with live internal recesses18 and 19. The gear wheel 16 and Genera lock 17 are each ofsubstantially one half the width of a computing wheel, the combinedwidth o1 both the gear wheel 16 and Geneva lock 17 being ofsubstantially the same width at a computing wheel. There is one nearwheel 16 to correspond with each computing wheel, with which it ispositively geared. The means for causing the gear wheel 16 and theGeneva lock 17 to act one when in the operat-ing Zone, is the livetoothed wheel. 20, the teeth 21 of which are adapted to jointly engagethe internal recesses 18 and 19 of a gear wheel 16 and a Geneva lock 17.There are a number of these wheels 20 loosely mounted on a stationaryshaft 31, supported on the arm 12. The hub oi the wheel 20 is of a widthcorresponding to that 01 a computing: wheel and or substantially thi.same width the gear wheel, 16 and the Genera stop wheel 1'? combined.The teeth 21 of the wheel 20, however are ot' a slightly less width, forthe iurpose of allowing the clearance required in the rapid operation ofthe computing mechanism.

is the gear does not extend beyond the main body of the computing wheelto which it is secured on the right, the gear portion of the wheel 16cannot be of greater width than the gear 2; therefore the teeth and aportion of the huh oil? the gear wheel 11] are cut away on the right, asshown at to allow cearance for the carrying pin 93, formed on theperiphery of the computing wheel 1. When any computing wheel isoperated, so as to make a complete rerolution, and the carrying pin 23comes in contact with one of the live recesses 2i in the Geneva stopwheel 17, and thereby rotates said wheel 17 through one filth of arevolution. it will through the medium of the live internal recesses 18and 19, in which are engaged the teeth 21 of the wheel 20, also carrywith it the gear wheel 16 immediately to the left, which is also inengagement with the teeth 21 of the wheel 20; and as this gear wheel 16is also in mesh with the gear 2 oi the next computingwheel. to the left,the said computing wheel will also be rotated through one tenth of arerolution. Should all the computing wheels in the operating zone. incase of addition. he standing at 9, at the time the operation takeslace, this action would he continued throughout the operating Zone, oras liar as the fire point wheels 0 extend. and until the particularnuinher wheel in mesh with the last gear wheel 16 in the operating Zonewas rotated. The rotation of this last gear 16 would not ailfect thenext computing wheel to the left. even though that computing; wheelshould also he standing at 9. because the rotation of the Geneva stopwheel 17 corresponding to this particular numhcr wheel would at thatpointhare no eil ect upon the rotation of the next computing wheel.owing to the fact that the next gear wheel 16 is not operativelyconnected with the Geneva stop wheel 17 at that time by reason of thereheino a break 'hetween the last wheel 20 and th fixed sleeve 26. whichlatter at this point. takes the place of the wheels 20. the teeth 27being cut away at for the purpose of limiting the carrying capacity ofthe mechanism, and to act as a safety device for breaking the throw fromone wheel to another at that particular point. i

The computing wheel in operative engagement with the operating meanscannot rotate the next, or any of the computing wheels, which are atthat time to the right of same, because the gear portion 16 of thecarrying mechanism, which is always in positive mesh with the gearportion 2 of the computing wheel referred to, is at tliat time free torotate with the computing wheel, but independently of the Geneva portion17 of such carrying mechanism, which at all other times must rotatewiththe gear portion 16 of the carrying mechanism. The reason for this is,that at the point where the computing wheels are in operative engagementwith the operating means, there is no five point wheel 20 on the shaft31, the teeth 21 of which at other points in the step by step travel ofthe computing mechanism to the left, are in positive engagement with theinternal recesses 18 and 19 in the hubs of both the gear carrying wheel16 and the Geneva lock wheel 17 corresponding therewith to complete thecarrying mechanism from that particular computing wheel to the next.There is also a cut away portion or collar 28 provided on the sleeve 29shown at the operating point; and it is this break 28, which extendsfrom the end of the teeth 30 on the fixed sleeve 29 to the teeth 21 ofthe first wheel 20, to the left which permits the computing wheel inengagement with the operating means to rotate freely, and withoutaffecting the next or any wheels then standing to the right of same. Thereason for this is that the gear wheel 16, in mesh with the gear portion2 of the computing wheel referred to, can rotate freely therewith aroundthe collar or hub 28 of the sleeve 29 secured to the shaft 31; but asthe carrying pin 23 on the computing wheel. being thus rotated, comes incontact withone ofthe recesses 24; of the next Geneva stop wheel 17,standing to the left of the gear wheel 16 in engagement with thecomputing wheel referred to, it will, through engagement with the recess24, carry said wheel 17 through one fifth of a revolution. This Genevalock wheel 17, will also, through the medium of the wheel 20, the teeth21 of which are also in engagement with the five internal recesses 18,of the next gear wheel 16 to the left, cause it to rotate through onefifth of a revolution; and as the external gear teeth of this wheel 16are always in positive engagement with the next computing wheel, it willalso, at the same time be carried by this operation through one tenth ofa revolution. Should the next computing wheel, or all the computingwheels in the operative zone be standing at 9, in case of addition, whenthe carrying pin 23 of the computing wheel in operation comes in contactwith and rotates the first Geneva stop wheel 17 to the left of thecollar 28 through one fifth of a revolution, then all the computingwheels to the left, that are within the operating Zone, which is limitedonly by the number of wheels 20 carried between the breaks or collars 25and 28, will be rotated through one tenth of a revolution, but allcomputing wheels which have passed beyond the five point wheels 20 willnot be affected in any way, nor will the computing wheels to the right,which are yet to the right of the break 28 because the shaft 31 isnon-rotatable and the teeth are carried on the sleeves to the right aswell as to the left of the idlers 20 and the breaks 28 and 25 on thesleeves.

lVhen a computing wheel to the right of a partition 14; is operated, thecarrying from one computing wheel to the next is carried through thepartition to the first wheel on the opposite side thereof, in thefollowing manner. The Geneva stop wheel 17 to the right of the partition14, has on its left an extended hub portion 32, which extends through apartition as shown at 33, and over which when in place is a fixed collar34-. The internal recesses 19 of the Geneva stop wheel 17, are extendedthrough the hub portion 32, so that when the carrying pin 23 of thecomputing wheel to the right of the partition lt, comes in contact witha recess 24: of the Geneva stop wheel 17, it rotates through the hubextension 32 of said wheel, two of the five point wheels 20 throughonefifth of a revolution, and as the second of these wheels 20, the onefarthest to the left, is also in positive engagement with the next gearwheel 16, and, as this wheel is also positively geared to the nextcomputing wheel 1 to the left, said computing wheel is actuated throughone tenth of a revolution.

It will be understood that only those tenscarrying devices which areincluded between the two breaks 25 and 28 can be active at any time. Thesleeves 27 and 29 are always idle, and may extend through any number oftens-carrying wheels to the left of the break 25 and to the right of thebreak 28. The wheels engaged by said idle sleeves 27, 29 are locked bysaid sleeves out of use. The motion of these wheels is de rived from,the master wheel 7, and only those tens-carrying wheels to the left ofsaid master wheel and to the right of the sleeve 27 can be connected tocarrier tens. In other words the extent to which tens can be carried islimited to substantially less than the whole number of adding wheels inthe system, although the tens-carrying mechanism is always effective, nomatter which of the main adding wheels are within the sphere of actionof said tens-carrying mech anism, said sphere of action or operatingzone extending from one break to the other breal' 28.

I claim 1. In a computing mechanism, number wheels, operating meanstherefor carrying mechanism for carrying from one number wheel to thenext, composed of a pinion and Gene a stop wheel, a shaft for supportingsame, said shaft, and said pinion and stop wheel being relativelymovable, and means loosely mounted on said shaft to enga e both thepinion and stop wheel, whereby they rotate as one, when actuated by therotation of the number wheel in operative engagement with the operatingmeans, substantially as described.

2. In a computing mechanism including a pinion and Geneva stop wheel,comprising number wheels and carrying mechanism therefor, means tooperate the number wheels, a shaft, means loosely mounted thereon havinga part adapted to engage the hubs of a pinion and Geneva stop wheel,said means and the pinion and Geneva stop wheel, being axiallyrelatively movable one to the other, and means whereby through therotation of the Geneva stop wheel, said pinion is caused to rotatetherewith through one fifth of a revolution, and through such rotation,actuate the next number wheel in mesh with said pinion, through onetenth of a revolution. substantially as described.

3. In a computing mechanism comprising number wheels and carryingmechanism therefor adapted to carry from one number wheel to the next,means to operate the num ber wheels, a shaft for said carryingmechanism, and means loosely mounted on said shaft whereby the rotationof said carrying mechanism. actuates the next number wheel through adistance corresponding therewith, such rotation being caused through therotation of the number wheel actuated by the operating means,substantially as described.

it. In a computing mechanism, number wheels, carrying mechanismtherefor, composed of a pinion and a Geneva. stop wheel. a stationaryshaft, both said pinion and said stop wheel being loosely mounted onsaid shaft, and means carried on said shaft adapted to engage both thepinion and Geneva stop wheel. whereby through the rotation of the numberwheel in operative engagement with the actuating means, the next numberwheel is actuated through onetenth of a revolution, substantially as described.

5. A computing machine. combining a se ric-s of denominational digitwheels: and denominational trains for carrying tens from one wheel tothe next, each train embodying a pair of relativel -rotatable elements,and a coupler for locking the same together to rotate in unison, saidpairs of rotatable elements and said couplers havingpermanently-unobstructed, relative lateral movement therebetween, so asto enable a coupler, during computation, to be disengaged from one pairof rotatable elements and directly engaged with the next pair at onesuch relative movement.

6. A computing machine, combining a series of denominational digitwheels; and denominational trains for carrying tens from one wheel tothe next, each train embodying a pair of relatively-rotatable elements,one connected with a digit wheel of lower order, and the other with adigit wheel of higher order, and a. rotatable coupler for keying saidelements together for rotation in unison, said pairs of rotatableelements and said couplers having permanently-unobstructed, relativelateral movement therebe tween, so as to enable a coupler, duringcomputation, to be disengaged from one pair of rotatable elements anddirectly engaged with the next pair at one such relative move ment.

7. The combination, with a series of de nominational digit wheels; oftens-carrying mechanism therefor, embodying a series ofindependently-rotatable couplers, and a series of pairs ofindependently-rotatable carrying wheels, each of such pairs comprisinga. pinion and a Geneva stop wheel arranged face to face. interposedbetween said couplers and said digit wheels and adapted to be lockedtogether by the former for rotation in unison, said pairs of carryingwheels and said couplers having permanent-ly-unobstructed, relativelateral movement therebetween. so as to enable a coupler, duringcomputation. to be disengaged from one pair of carrying wheels anddirectly engaged with the next pair at one such relative movement.

8. The combination, with a series of denominational digit wheels: oftens-carrying mechanism therefor, embodying a series of pairs ofindependently-rotatable carrying wheels, each of such pairs comprising apinion and a Geneva stop wheel, and a series of independently-rotatablecoupler disposed internally of said pairs of carrying wheels to lock thecomponent members of the latter together for rotation in unison. saidpairs of carrying wheels and said cou plers havingpermanently-unobstructed, relative late al movement therebetween. so asto enable coupler, during computation. to be disengaged from one pair ofcar ying wheels and dirccth engaged with the next pair at one suchrelative movement.

9. A computing machine, combining a series of denominational digitwheels; and denominational devices for carrying tens from one wheel tothe next, each tens-carrying device embodying a. locking wheelconstantly engaging the digit wheel of lower denomination, a carryingwheel constantly engaging the digit wheel of higher denomination, saidlocking wheel and said carrying wheel rotatable relatively to eachother, and a member for keying said locking wheel and said carryingwheel together to rotate in unison, said locking and carrying wheels andsaid keying members having permanently-unobstructed, relative lateralmovement therebetween, so as to enable a keying member, duringcomputation, to be disengaged from the locking and carrying Wheels ofone tens-carrying device and directly engaged with those of the nextdevice at one such relative movement.

10. The combination, with a master wheel, and a gang of computingwheels; of Geneva movements for carrying tens from wheel to wheel alongthe gang, each Geneva movement comprising a pair of cooperating membersdisconnected from each other; and a series of devices associated withthe cooperating members of said Geneva movements for connecting thesame, a part of the series of connecting devices acting to coupletogether for rotation the cooperating members of the Geneva movementsbelow the master wheel, the first-named part at and above the masterwheel, and the remaining part acting to lock against rotation thecooperative members of the Geneva move ments below the master wheel, thefirst-named part of the series of connecting devices being spaced fromthe second-named part to disrupt connection between the Geneva movementat the master wheel and that next below.

11. The combination, with a master wheel, and a gang of computingwheels; of Geneva movements for carrying tens from wheel to wheel alongthe gang, each Geneva movement comprising a pair of cooperating membersdisconnected from each. other; a set of independently-revoluble elementsassociated with the cooperating members of the Geneva movements at andabove the master wheel, to couple the same together for rotation; and asingle stationary element for engaging the cooperating members of all ofthe Geneva movements below the master wheel to prevent rotation thereof.

12. The combination, with a master wheel, and a gang of computingwheels; of Geneva movements for carrying tens from wheel to wheel alongthe gang, each Geneva movement comprising a pair of cooperating membersdisconnected from each other; means for connecting together for rotationthe cooperating members of the Geneva movements at and above the masterwheel; and means distinct from the lastnamed means for connectingtogether, as a lock against rotation, the cooperating members of theGeneva movements below the master wheel, the firstand second-namedconnecting means and the said Geneva movements havingpermanently-unobstructed, relative lateral movement therebetween, so asto enable said firstand second-named connecting means, duringcomputation, to directly engage the cooperating members of thesuccessive Geneva movements at suc cessive relative movements.

13. The combination, with a master wheel, and a gang of computingwheels; of Geneva movements for carrying tens from wheel to wheel alongthe gang, each Geneva movement comprising a pair of cooperating membersdisconnected from each other; a set or" independently-revoluble elementsassociated with the cooperating members of the Geneva movements at andabove the master wheel, to couple the same together for rotation; and asingle stationary element for engaging the cooperating members of all ofthe Geneva movements below the master wheel to prevent rotation thereof,the said Geneva movements and the said coupling elements and lockingelement having permanently unobstructed, relative lateral movementtherebetween, so as to enable, at one such relative movement duringcomputation, the coupling elements to be disengaged from the Genevamovements with which they were engaged and directly engage with the nexthigher Geneva movements, and the locking element to be directly engagedwith the next higher Geneva movement.

14. The combination, with a gang of computing wheels; of devices forcarrying tens along said gang, each tens-carrying device comprisingmembers free of connection to each other; a series ofindependently-movable connectors icr connecting together the members ofthe tenscarrying devices in succession, said tens-carrying devices andsaid series of connectors having permanently unobstructed, relativelateral traveling movement therebetween; and means at each end of saidseries of connectors for engaging the members of the tens-carryingdevices opposite the same, to hold them against rotation, each of saidholding means andthe adjacent end of the series of connectors having agap intervening therebetween.

15. In a computing machine, the combination with a series of computingwheels, of a casing for said wheels, partitions in aid casing at eachfourth unit space, a carry over wheel for each computing wheel, anelongated hub on each carry over wheel that extends past the adjacentpartition, and a collar fast on said partition holding said carry overwheel alined by its hub.

16. In a computing machine, the combination, with computing wheels; ofcarryover devices each comprising a gear permanently engaging itscomputing wheel, and

an idle wheel associated with each carryover gear, but detachedtherefrom; a master wheel arranged to drive said computing wheelsacrz'atim; members permanently located on one side of said master wheelfor coupling each idle wheel to its carry-over gear, so as to lock foroperation the carryover devices at and above the master wheel; and afixed member permanently located on the other side of said master wheelfor locking the carry-over devices below th master wheel againstoperation.

17. lhe combination, with a set of computing wheels, and a master wheelfor driving the same; of a tens-carrying train extending from eachcomputing wheel to the next higher computing wheel, each train beingnormally broken or interrupted, so as to be incapable of carryingbetween juxtaposed computing wheels; and coupling means for completingsaid trains scrim i722, said coupling means and said trains having astep by-step, relative lateral movement therebetween, which ispermanently unobstructed, so that at each stop said coupling means willbe disengaged from one train and directly engaged with the next.

18. A computing apparatus combining a totalizer, a master wheel, saidmaster wheel and totalizer having relative traverse in axial direction,tens-carrying trains connecting adjacent denominations of the totalizer,said trains each comprising a pair of coaxial elements relativelyrotatable, and rotatable devices to couple said elements, said couplingdevices being permanently disposed to the left of said master wheel andcontrolled with relation to said trains by said relative traverse.

19. In a computing machine, the combination, with a series of computingwiieels, and carry-over wheels driven thereby; of a connection betweeneach carry-over wheel and the next higher computing wheel, comprising agear for said computing wheel and a gear .for said carry-over wheelconstantly meshing with the first-named gear, said computing wheels andtheir gears, and said carry-over wheels and their gears constituting twocompanion series oi? coaxial elements, one of which series has itsassociated component elements connected to rotate in unison, the otherseries having its component elements free of connection and formed withalining internal teeth or notches; and toothed coupling devices disposedinternally of said other series for engagement with the teeth or notchesthereof, to connect together associated elements of that series forrotation in unison, but releasable therefrom to break such connection.

20. A computing apparatus combining a series of computing wheels, amaster wheel arranged to operate them scriatim, denominationalcarry-over devices each comprisingtwo coaxial members and forming atrain with said wheels either driving or locking each wheel from the onebelow, a gear coaxial with each computing wheel forming part of thecorresponding carry-over train, two coaxial elements of each train beingp rmanent-ly coupled and the other two normally uncoupled, and keyingmeans fixed relatively to the master wheel for coupling the uncoupledcoaxial elements of each train above the master wheel.

21. A. computing apparatus combining a series of computing wheelsarranged together in a set to form computing head, a master wheel fordriving said computing wheels scrirrz' im, carry-over mechanism forenabling one computing wheel to carry tens to or borrow tens from thenext higher computing wheel, and coupling means internal to saidcarry-over mechanism for enabling the locking of said computing wheelsagainst movement, said set of computing wheels and said coupling meanshaving permanently unobstructed relative tram cling movement, so thatsaid computing wheels may be locked successively one by one againstmovement.

22. The combination, with a series of computing wheels, and a mastermember; of a set of tens-carrying devices comprising, each, a pair ofrelatively movable members; a series of independently-movable connectorsfor coupling together the members of the successive tens-carryingdevices at and above the master member, said computing wheels and mastermember, and said tenscarrying devices and connectors having relativetraverse therebetween; and means disposed in advance of said series ofconnectors for successively engaging the relativelymovable members oftens-carrying devices opposite the same, to hold them against rotation.

23. The combination, with a series of computing wheels, and. a mastermember; of a set of tens-carrying devices comprising, each, a pair ofrelatively-movable members; a series of independently-movable connectorsfor coupling together the members of the successive tens-carryingdevices at and above the master member, said computing wheels and mastermember, and said tens-carrying devices and connectors having relativetraverse thcrebetween; means disposed'in advance of said series ofconnectors for successively engaging the relatively-movable members oftens-carrying devices opposite the same, to hold them against rotation;and means for breaking the transfer between successive tens-carryingdevices engaged with the front connector and with said holding means.

The combination, with a series of computing wheels, and a master member;of a set of tens-carrying devices comprising,

each, a pair of relatively-movable members; a series ofindependently-movable connectors for coupling together the members ofthe successive tens-carrying devices at and above the master member,said computing wheels and master member, and said tenscarrying devicesand connectors having relative traverse therebetween; and means disposedin advance of said series of connectors for successively engaging therelativelymovable members of tens-carrying devices opposite the same, tohold them against rotation, said holding means and the front connectorhaving a gap between them, to break the transfer between successivetenscarrying devices engaged with the front connector and with saidholding means.

25. The combination, with a series of computing wheels, andnormally-open trains for carrying tens from wheel to Wheel; of a masterwheel for driving said computing wheels; a series ofindependently-movable elements for closing the successive tenscarryingtrains at and above the master wheel, said computing wheels and masterwheel, and said tens-carrying trains and closing elements havingrelative traverse therebetween; and means disposed in advance of saidseries of closing elements for successively locking against operationthe trains opposite said means.

In testimony whereof I have hereunto setmy hand in the presence of twosubscribing witnesses.

'WVALTER WRIGHT. Witnesses:

NELLIE B. KEATING, EUGENE W. LEVY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

